1. Where the complainant has suspended obligations in accordance with Article 178 or where the arbitration panel has imposed a penalty payment on the respondent in accordance with Article 178(1), the respondent shall notify the complainant of any measure it has taken to comply with the ruling of the arbitration panel and of its request for an end to the suspension of obligations applied by the complainant or to the penalty payment.

2. If the Union and the United Kingdom do not reach an agreement on whether the notified measure brings the respondent into conformity with the provisions of this Agreement within 45 days of the date of submission of the notification, either party may request the original arbitration panel in writing to rule on the matter. Such request shall be notified simultaneously to the other party. The arbitration panel ruling shall be notified to the Union and the United Kingdom and to the Joint Committee within 75 days of the date of submission of the request.

If the arbitration panel rules that the respondent has brought itself into conformity with this Agreement, or if the complainant does not, within 45 days of the submission of the notification referred to in paragraph 1, request that the original arbitration panel rule on the matter:

(a) the suspension of obligations shall be terminated within 15 days of either the ruling of the arbitration panel or the end of the 45-day period;

(b) the penalty payment shall be terminated on the day after either the ruling of the arbitration panel or the end of the 45-day period.

3. In the event of the original arbitration panel, or some of its members, being unable to reconvene to consider a request under paragraph 2, a new arbitration panel shall be established as set out in Article 171. The period for notifying the ruling shall in that case be 90 days from the date of establishment of the new arbitration panel.

4. Where a case referred to the arbitration panel pursuant to paragraph 2 raises a question of interpretation of a concept of Union law or a question of interpretation of a provision of Union law referred to in this Agreement, Article 174 shall apply mutatis mutandis.